EP1790508B1 - Method for determining an actual value for a temperature control of a vehicle having an opened roof - Google Patents

Abstract

Method involves measured value of external temperature sensor (56) and measured value of interior assigned temperature sensor (52) is combined. Priority of external temperature sensor value is more and priority of interior assigned temperature sensor is very less and as external temperature increases priority of value of external temperature sensor is less and priority of the value of assigned temperature sensor is as high as external temperature is low.

Description

The invention relates to a method for determining a temperature value in a equipped with an air conditioner with an outside temperature sensor and a temperature sensor for the interior, designed as a convertible and / or provided with a sunroof or the like vehicle opening vehicle as an actual value for an interior temperature control of the air conditioner with the top down or Sunroof or the like opening of the vehicle.

Vehicles equipped with manually or automatically operated air conditioning systems are becoming increasingly popular, among other things because, among other things, the risk of operator fatigue when moving in a well-conditioned environment at e.g. Room temperature, i. is located in a suitably air-conditioned vehicle interior, is reduced. Known air conditioners work basically satisfactory, but are designed primarily for vehicles with passenger compartments, which have a built-in body, fixed roof.

When installing an air conditioner in a vehicle with removable top or sunroof or other permanently open while driving relatively large openings shows, however, that measured by an interior of the vehicle interior temperature sensor measured temperature value for the open top or the like opening in the interior given temperature is not representative.

It is known to operate a vehicle air conditioner differently depending on the opening or closing state of a vehicle opening such as a detachable top, a roof opening or a window opening. Examples of this can be found in DE 38 43 898 C1 . DE 41 05 143 C1 . DE 102 35 580 A1 . DE 102 57 587 B3 . DE 103 42 987 A1 . EP 0 375 871 B1 . EP 0 857 593 B1 and WO 2004/052668 A1 ,

In practice, it has been found that the known air conditioning systems, for example, in the case of a vehicle designed as a convertible with open roof and extreme weather conditions (very high or relatively low outside temperatures) do not work satisfactorily.

The object of the invention is therefore to provide a method with which it is possible to operate a designed for a closed passenger compartment air conditioning system even to achieve a driver and the passengers satisfactory air conditioning, if the top or the sunroof or another vehicle opening is open to the interior of the vehicle.

• der Messwert des Außentemperaturfühlers und der Messwert des dem Innenraum zugeordneten Temperaturfühlers kombiniert werden, wobei
• die Wichtung des Messwertes des Außentemperaturfühlers um so stärker und die Wichtung des Messwertes des dem Innenraum zugeordneten Temperaturfühlers um so geringer ist, je höher die Außentemperatur ist, und
• die Wichtung des Messwertes des Außentemperaturfühlers um so geringer und die Wichtung des Messwertes des dem Innenraum zugeordneten Temperaturfühlers um so stärker ist, je niedriger die Außentemperatur ist.

To achieve this object, the invention provides a method for determining a temperature value in a equipped with an air conditioner with an outside temperature sensor and a temperature sensor for the interior, designed as a convertible and / or provided with a sunroof or other closable interior opening vehicle as an actual value for a Interior temperature control of the air conditioning with the top or sunroof open or another vehicle interior opening proposed, wherein in the process

• the measured value of the outside temperature sensor and the measured value of the temperature sensor associated with the interior are combined, wherein
• the higher the outdoor temperature, the lower the weighting of the measured value of the outside temperature sensor and the lower the value of the measured value of the temperature sensor assigned to the interior, the lower the temperature
• the lower the outdoor temperature, the lower the weighting of the measured value of the outside temperature sensor and the greater the weighting of the measured value of the temperature sensor assigned to the interior temperature.

Air conditioning systems are conventionally operated in particular on the basis of the three parameters outside temperature, indoor temperature and solar radiation. Of the two ambient temperature and solar radiation parameters, the outside temperature has a noticeable effect on the operation of the air conditioning system when one of the openings described above is permanently open during a trip. The invention will be described below with reference to a convertible as a representative of a vehicle with interior opening.

With the invention, a special way of determining a temperature value as the actual value for the vehicle interior temperature control is proposed when the interior opening of the vehicle, so the hood of the convertible, is open. According to the invention, the measured values of the outside temperature sensor and the temperature sensor assigned to the interior (referred to below as the interior temperature sensor) are included in this actual temperature determination. The weighting with which the measured values of these two sensors are weighted and combined differs depending on the outside temperature. According to the invention, the procedure is such that, the higher the outside temperature is, the lower the weighting of the measured value of the interior temperature temperature radiator in the combined measured value. This is due to the fact that at high outside temperatures, ie, for example, in the summer, the vehicle occupants expect them incoming cooling air. The interior temperature sensor could deliver a measured value just in these weather conditions, which is not representative of the temperature to which the vehicle occupants, in particular in the head area, are exposed. In other words, the actual value for the interior temperature control is determined to a large degree by the measured value of the outside temperature sensor at high outside temperatures.

The influence of the measured value of the interior temperature sensor, on the other hand, is low. Somewhat different is the situation at low outside temperatures, such as those in the transition months from autumn to winter and from winter to spring are encountered, in which the passengers of a convertible but nonetheless want to drive with the top down. Even during these weather conditions, passengers are exposed to low outside temperatures, especially in the upper part of the body. If, however, this low outside temperature were to be incorporated into the actual value for the interior temperature control with great influence, relatively warm or hot air would be blown into the passenger compartment via the footwell openings. Namely, the air conditioner operates at low outside temperatures in the heating mode, in which hot air is introduced into the passenger compartment at the bottom. If only the outside temperature is taken into account, there is the danger that the air blown into the footwell is too hot and consequently perceived as unpleasant. Therefore, according to the invention, the measured value of the interior temperature sensor is weighted more heavily at lower temperatures than at high outside temperatures or the measured value of the outside temperature sensor is less weighted than the measured value of the interior temperature sensor.

wobei T_IST der Istwert für die Innenraumtemperaturregelung, T_AUSSEN der Messwert des Außentemperatursensors, T_INNEN der Messwert des Innenraumtemperaturfühlers und k ein Wichtungskoeffizient ist, der einen Wert zwischen 0 und 1 annimmt.According to the invention, therefore, the interior temperature actual value for the interior temperature control is determined according to the following general calculation varnish: $${\mathrm{T}}_{\mathrm{IS}}\mathrm{=}{\mathrm{T}}_{\mathrm{OUTSIDE}}\mathrm{\times }\mathrm{k}\mathrm{+}{\mathrm{T}}_{\mathrm{INSIDE}}\left(\mathrm{1}\mathrm{-}\mathrm{k}\right)$$

where T _is the actual value for the interior temperature control, T _OUTSIDE, the measured value of the outside temperature sensor, T _INSIDE, the measured value of the indoor temperature sensor, and k is a weighting coefficient that takes a value between 0 to 1.

der Wichtungskoeffizient ist also eine Funktion der Außentemperatur.For the weighting coefficient k, the following applies: $$\mathrm{k}\mathrm{=}\mathrm{f}\left({\mathrm{T}}_{\mathrm{OUTSIDE}}\right)\mathrm{.}$$

the weighting coefficient is therefore a function of the outside temperature.

As mentioned above, in addition to the outside temperature, the solar radiation also affects the climate in the interior of a vehicle. The effects of solar radiation are different when the top of the vehicle is closed and open. Thus, solar radiation affects the vehicle occupants much more powerful and faster when the hood is open than when the hood is closed. This circumstance is taken into account in an advantageous development of the invention that the weighting of the measured value of the outside temperature sensor with respect to the weighting of the measured value of the interior temperature sensor associated with the same outside temperature is greater, the higher the determined solar radiation intensity.

wobei I_S die Intensität der Sonneneinstrahlung ist. Die Intensität wird gewöhnlich über einen Sonnensensor ermittelt. Unter Zuhilfenahme des Messwerts des Außentemperatursensors kann die Auswirkung der gemessenen Sonnenintensität auf die Fahrgäste noch zusätzlich bewertet werden, indem nämlich anhand der Außentemperatur zwischen kalter und warmer Jahreszeit unterschieden werden kann.In this embodiment of the invention, the weighting coefficient thus results as $$\mathrm{k}\mathrm{=}\mathrm{f}\left({\mathrm{T}}_{\mathrm{OUTSIDE}}{\mathrm{I}}_{\mathrm{S}}\right)\mathrm{.}$$

where I _{S is} the intensity of solar radiation. The intensity is usually determined by a sun sensor. With the help of the measured value of the outside temperature sensor, the effect of the measured sun intensity on the passengers can be additionally assessed, namely by distinguishing between the cold and the warm season by means of the outside temperature.

The inventive method can be easily implemented in an existing air conditioning by the climate control receives the signal of a state of the convertible top of a convertible sensor. Depending on the signal from this sensor, the air conditioner may change from its conventional closed interior mode to the present invention Switch operating mode for the open interior. Such a sensor or additional sensors can / can detect the opening state of a sliding roof or the like roof opening or the opening state of a window in addition to the opening state of a hood. The switching of the air conditioner operation or the manner of determining the actual value for the indoor temperature control is in all cases as described above. It is expedient if the weighting factor is chosen differently depending on the type of interior opening (complete top, sliding roof or window), if it is to be expected that the climatic conditions in the interior of the vehicle, depending on which interior opening is open, could be different ,

Fig. 1

in Seitenansicht ein Fahrzeug mit schematisch dargestellter Klimaanlage und

Fig. 2

ein Blockschaltbild der Hauptkomponenten des Regelungssystems der erfindungsgemäß betriebenen Klimaanlage.

The invention is described below with reference to the figures, in which a side view of a vehicle with air conditioning is shown schematically. In detail show:

Fig. 1

in side view of a vehicle with schematically illustrated air conditioning and

Fig. 2

a block diagram of the main components of the control system of the present invention operated air conditioning.

In the figures, the air conditioner is described by means of an air-side controlled system. However, the invention is not limited to such air conditioning systems. Likewise, the invention can be implemented in a vehicle with water-side controlled air conditioning.

According to Fig. 1 For example, an air conditioning system 10 for a motor vehicle 12 has a blower 14 which, depending on the position of a fresh air / circulating air flap 16, draws in fresh air from a fresh air intake duct 18 or from a circulating air duct 22 ending in the interior 20. When viewed in the flow direction behind the blower 14, there is an air temperature control device 24 (air-side control in this example, with temperature control devices controlled on the water side can also be used) with a cooling unit 26 for cooling the intake air. The cooled (and dehumidified) air flows through one of two mutually parallel channels 30,32 depending on the position of a mixer flap 28 of the air temperature control device 24. One of these two channels (in the embodiment of the channel 32) has a heating unit 34 for heating the previously cooled air. Behind the heat exchanger 34, the two channels 30,32 are brought together again in a mixing chamber 36. Adjoining the mixing chamber 36 is an air distribution device 38, which has two flaps 40, 42 in order to let the air into the interior space 20, optionally via the man-up openings 44, defroster openings 46 and / or foot-space outflow openings 48. The aforementioned elements of the air conditioning system are part of their air supply system.

The control of the entire air conditioning system 10 is basically such that a setpoint temperature T _{SOLL, which can be} preset via a setpoint temperature setting device 50, is reached and maintained for the interior space 20. For this purpose, the air conditioner 10 as an actual temperature-determining device on a temperature sensor 52, which measures the actual value T _actual indoor temperature and, for example, as the setpoint temperature adjustment device 50 is housed in the control unit 54. The air conditioner 10 also has various sensors such as an outside temperature sensor 56 and a sun sensor 58, the signals of which are supplied to a central control unit 60 which drives actuators for, inter alia, the blower 14 and the various flaps of the air supply system according to a control algorithm.

The motor vehicle 12 is formed in this embodiment as a convertible, the top 62 can be opened and closed. 64 denotes a sensor which detects the state (open or closed) of the top 62 and reports it to the central control unit 60. The central control unit 60 controls the air conditioner differently depending on the signal of the sensor 64, which will be discussed later. It should be emphasized at this point that a convertible vehicle is not the only example of a vehicle whose air conditioning system is operated according to the invention can be. Thus, the air conditioning system can also be operated differently depending on the opening or closing state of other openings leading into the interior 20, such as, for example, a roof opening or a window.

Fig. 2 shows another illustration of the Regei system of the air conditioning system 10 of the vehicle 12 according to Fig. 1 , The control unit 60 comprises an interior temperature control device 66, which receives the difference signal between the set desired temperature and optionally the measured by means of the temperature sensor 52 or the determined from the measured value and the measured value of the outside temperature (actual) temperature. The interior temperature control device 66 influences inter alia the blower 14, the air temperature control device 24 and the flaps of the air distribution device 38.

The control unit 60 further comprises an actual temperature detection means 68 which is active or inactive depending on the state of the top 62 (open or closed). This actual value temperature determination device 68 is switched on when the top 62 is open. For example, in this case, a switch 70 switches the output signal of the temperature sensor 52 for the inner space 20 to the actual temperature detection device 68.

In this determination device 68 is also the output of the outside temperature sensor 56 a. Furthermore, the detection device is also controlled by the signal of the sun sensor 58.

The calculation rule according to which, in the case of the open state of the top 64, the actual value for the interior temperature control device 66 is determined is in Fig. 2 specified. The two measured values for the outside temperature and the interior temperature are combined in a weighted manner. The two weighting coefficients add up to 1 and 100%, respectively. The greater the weighting of a measured value, the lower the weighting of the other measured value entering into the combination. The weighting factor for the measured value of the outside temperature sensor 56 results as a function of the outside temperature and the solar radiation intensity.

The higher the outdoor temperature, the greater the weighting factor for the reading of the outdoor temperature sensor 56, i. the smaller is the weighting factor for the measured value of the temperature sensor 52 assigned to the interior 20. Depending on the solar radiation intensity, the weighting factor of the measured value for the outside temperature increases. At the same outside temperature, the stronger the solar radiation intensity, the greater the weighting factor.

With the inventive concept of determining a temperature value, which enters as the actual value in the interior temperature control, the concept of climate control with the proviso "warm feet and cold head" is followed even with the top 62 open. This is done by in the case of high outside temperatures, the measured value of the interior temperature sensor 20 associated with 52 receives little weighted in the calculation. In the case of low outside temperatures, the measured value of the temperature sensor 52 for the interior 20 is given greater importance for the interior temperature control, since too high a weighting of the measured outside temperature could cause the air flowing into the footwell on the feet and legs of the passengers to be too warm feeling.

The invention has been described above on the basis of influencing the actual value for the interior temperature control. It is equivalent to this if, instead of the actual value, one would influence the setpoint value for the interior temperature control, the influence in this case having to be carried out with the opposite sign to the above considerations. It is also conceivable to influence the difference signal from the preset desired value and the measured actual value in the manner according to the invention. All these variants are functionally equivalent approaches to the invention.

LIST OF REFERENCE NUMBERS

10

air conditioning

12

motor vehicle

14

fan

16

Fresh air / air recirculation flap

18

Fresh air intake duct

20

inner space

22

return air duct

24

Lufttemperiervorrichtung

26

cooling unit

28

mixer flap

30

channels

32

channels

34

heater

36

mixing chamber

38

air distribution

40

fold

42

fold

44

Mannanströmöffnungen

46

defroster

48

Fußraumauströmöffnungen

50

Target temperature setting device

52

temperature sensor

54

control device

56

Outdoor temperature sensor

58

sun sensor

60

control unit

62

roof

64

hood sensor

66

Interior temperature control device

68

Isttemperaturwert determiner

70

switch

Claims (2)

1. Method for determining a temperature value in a vehicle (12) which is equipped with an air condition system (10) having an outside temperature sensor (56) and a temperature sensor (52) for the interior (20) and which is designed as a convertible and/or a vehicle with a sliding roof or another closable opening of the interior, said value being determined as an actual value for the interior temperature control of the air condition system (10), when the top (62) or the sliding roof or other opening of the vehicle interior is open, wherein in the method

   - the measured value of the outside temperature sensor (56) and the measured value of the temperature sensor (52) assigned to the interior (20) are combined, wherein

   - the weight of the measured value of the outside temperature sensor (56) is the greater and the weight of the measured value of the temperature sensor (52) assigned to the interior (20) is the smaller, the higher the outside temperature is, and

   - the weight of the measured value of the outside temperature sensor (56) is the lower and the weight of the measured value of the temperature sensor (52) assigned to the interior (20) is the greater, the lower the outside temperature is.
2. Method as defined in claim 1, wherein the vehicle (12) additionally comprises a sunlight sensor (58) for determining the intensity of the solar radiation, and the method being characterized in that, for constant outside temperatures, the weight of the measured value of the outside temperature sensor (56) is the larger with respect to the weight of the measured value of the temperature sensor (52) assigned to the interior (20), the higher the determined intensity of solar radiation is.

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